That 260gr WFN at your 950fps and "normal" revolver distances, up to about 75 yards (depending almost entirely on your capability to put the bullet where it needs to go), should do quite nicely on up to Whitetail Deer size. On Veral Smith's DV scale that would rate about 85.5 and he speaks of 100 as a minimum, but also states some good marksmen have done well as low as 80 on that scale. I've taken fairly large Buck Antelope at over 100 yards with a DV of only 78. bang-flop. Shot placement is almost everything, expecially with handguns. You do NEED a good bullet.
I'm assuming you are shooting open sights and I suspect whatever range you can keep all shots on a desert-sized paper plate should work as an effective maximum range for you. Let that WFN do the rest. Recommend starting fairly close and working the target out further each time you can consistently stay on the plate. You will see where it starts to fall apart.
This may be a good place to put in a plug for IHMSA. It's a great bunch of people and the Field Pistol Course taught me what I needed to know about what I could do with my handgun; and what my limitations were out to 100 yards. First time I ever shot a Freedom Arms revolver and the only time I ever shot a 454Casull was about my 3rd year of competition. 10 for 10 with headshots on 100 yard Rams. I nearly fell down! Money is all that has kept me from owning one. Fantastic! I don't shoot like that anymore, but I do remember when....
Good luck and keep us informed of your exploits.
Regards,
Sweetwater